The central powers consisted mostly of nazi Germany, Italy, Japan, Romania, Bulgaria, and Hungary.
Allied powers consisted of United States, Great Britain, Russia (USSR), France, Poland... pretty much the rest of the world. (This is for WW2 if you want WW1 message me or comment on this). Hope this helped!
The crusades introduced Europe to the works of Middle Eastern scholars, philosophers, and doctors. Richard the Lion-heart, King of England and one of the most famous Crusader Kings, had an Arab physician.<span />
The Answer is
B) freed slaves
The US were splitting? The Declaration of Independence
